If you’re content with the look of the eBook, you can publish it. This doesn't publish your eBook to Kindle Immediate Publishing, but makes the .kpf file and you can add that file to Kindle Immediate Publishing, instead of your Phrase file. Luckily, it is possible to unenroll your book https://maplepublishers.com/blog/what-services-do-ebook-self-book-publishers-in-london-require/